Heckler & Koch’s “Operational Briefcase” is a clever system for covert carry of a submachine gun without the need to conceal such a large type of weapon under bulky clothing. By putting the gun into a briefcase, they gave security personnel a way to blend right into the business and executive type of environment. Of course, the idea has become rather well known, at least in some circles. It may not have quite the same element of surprise it once did, but it is still a remarkably discreet contraption.
Sorry, I didn’t watch the video yet, can it be shot with it still inside? Looks like a trigger on the case handle.
Yes, the round thing by the normal trigger is a bar linking the handle trigger to the normal trigger.
Yes here’s a page with a better view of the empty briefcase and mechanism.
There is a different version of the case which can’t fire the gun, but instead has a button that causes the case to fall away while the gun remains connected to the case handle. Page and a video.